I've been scratching my head on this one for a while, so i'm hoping one of you will see something i'm missing.
(simplified layout)
2 sites connected with direct buried fiber. 6509sup720 on the main site (lan and server farm subnets), 3570emi on the remote site. Randomly the remote site will lose connectivity to specific servers in the server farm. Unable to ping one server, but can ping servers in the same subnet as the unavailable server. A few minutes later the device will be available again (sometimes coinciding with a reboot or a windows network connection "repair").
The PCs on the main site lan do not have this problem and the server is accessible by them even when it is not for the remote site (so the server is up). It does appear to happen to multiple PCs at the same time on the remote site (I have not been able to confirm that it is inaccessible for all at the remote site yet.)
This is a sporatic problem so it's hard to troubleshoot since i can't recreate it. Any ideas what i should be looking for, or what could cause a single device to "disappear" from a PC's access. Below is a brief post of the 3750 config, showing most of the basic commands and a typical pc port and the uplink to the main site:
clock timezone CST -6
clock summer-time CDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
udld enable
ip subnet-zero
no ip source-route
ip routing
ip domain-name local.cityofevanston.org
ip name-server 10.20.6.10
ip name-server 10.2.4.1
!
!
!
!
no file verify auto
!
spanning-tree mode pvst
spanning-tree portfast default
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
spanning-tree uplinkfast
spanning-tree vlan 1,10 priority 61440
!
vlan internal allocation policy ascending
!
interface FastEthernet0/15
switchport access vlan 10
switchport trunk encapsulation dot1q
switchport voice vlan 61
no logging event link-status
spanning-tree portfast
spanning-tree guard root
!
interface GigabitEthernet0/3
description Fiber to Service Center * BluePill *
switchport access vlan 110
switchport mode access
udld port
!
interface Vlan10
ip address 10.11.9.1 255.255.255.0
ip helper-address 10.20.6.10
!
interface Vlan110
description Fiber to Service Center * BluePill *
ip address 10.10.10.90 255.255.255.0
!
router eigrp 20
network 10.0.0.0
network 172.16.0.0
no auto-summary
no eigrp log-neighbor-changes
!
ip classless
ip route 0.0.0.0 0.0.0.0 10.11.18.2
ip route 0.0.0.0 0.0.0.0 10.11.8.2
ip route 10.11.14.0 255.255.255.0 10.11.8.2
ip route 10.11.16.0 255.255.255.0 10.11.8.2
ip route 172.16.254.91 255.255.255.255 10.6.60.5
ip route 209.174.60.0 255.255.255.0 10.11.8.2
ip http server
